Sharpen AI 2.2.2: previews not consistent with output file?

Having used SharpenAI for a couple of days I have now run into another issue. I mostly process animal pictures and I have found the preview - especially in comparison mode - to be inaccurate to the actual output. The preview pictures show artefacts in the form of pixel clusters, especially in the right and upper corner of the preview. I have uploaded a screenshot of the preview (it has the “focus” button in it) and a screenshot of about the same crop from the output file.

Anyone else experiencing this issue?

https://ibb.co/K5qfJRk (output file crop)
https://ibb.co/0Gwt436 (preview crop)